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stdbuf OPTION... COMMAND
Run COMMAND, with modified buffering operations for its standard
Mandatory arguments to long options are mandatory for short options
Adjust standard input stream buffering
Adjust standard output stream buffering
Adjust standard error stream buffering
--help display this help and exit
output version information and exit
If MODE is 'L' the corresponding stream will be line buffered. This
option is invalid with standard input.
If MODE is '0' the corresponding stream will be unbuffered.
Otherwise MODE is a number which may be followed by one of the follow-
ing: KB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P,
E, Z, Y. In this case the corresponding stream will be fully buffered
with the buffer size set to MODE bytes.
NOTE: If COMMAND adjusts the buffering of its standard streams ('tee'
does for e.g.) then that will override corresponding settings changed
by 'stdbuf'. Also some filters (like 'dd' and 'cat' etc.) don't use
streams for I/O, and are thus unaffected by 'stdbuf' settings.
tail -f access.log | stdbuf -oL cut -d ' ' -f1 | uniq
This will immedidately display unique entries from access.log
On GLIBC platforms, specifying a buffer size, i.e. using fully buffered
mode will result in undefined operation.
Written by Padraig Brady.
info coreutils 'stdbuf invocation'
should give you access to the complete manual.
GNU coreutils 8.4 November 2015 STDBUF(1)